LanePlanner: offsets cleanup (#23459)
LanePlanner: offsets cleanup (#23459)

* update comments

* model y axis was flipped so flip the offsets as well

* fix
commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot,commaai/openpilot